general protection fault in crypto_remove_spawns (2)

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 4b3c31c8d4dd Merge branch 'i2c/for-current' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=144cb817400000
kernel config: https://syzkaller.appspot.com/x/.config?x=b05cfdb4ee8ab9b2
dashboard link: https://syzkaller.appspot.com/bug?extid=ee4f315443a4ea97512e
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+ee4f31...@syzkaller.appspotmail.com

binder: 18706:18709 ioctl 40046207 0 returned -16
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 18713 Comm: cryptomgr_test Not tainted 5.0.0-rc1+ #21
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:crypto_remove_spawns+0x7ac/0x1340 crypto/algapi.c:194
Code: 49 8d 7c 24 10 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 f2 06 00 00 49
c7 44 24 10 00 00 00 00 4d 8d 66 10 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 0f
85 ef 06 00 00 49 83 7e 10 00 74 0a e8 4e 9e 24 fe
RSP: 0000:ffff888054737b88 EFLAGS: 00010202
RAX: 0000000000000002 RBX: dffffc0000000000 RCX: 1ffff1100a8e6f86
RDX: 0000000000000000 RSI: ffffffff835d58d2 RDI: ffff888085c226b8
RBP: ffff888054737df8 R08: ffff88804fb4e4c0 R09: ffff88804fb4ed60
R10: ffff88804fb4ed40 R11: 0000000000000001 R12: 0000000000000010
R13: ffffed100a8e6f8e R14: 0000000000000000 R15: ffff888054737dd0
FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6091a29000 CR3: 00000000876f9000 CR4: 00000000001406e0
kobject: 'loop2' (00000000d1d42c09): kobject_uevent_env
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
kobject: 'loop2' (00000000d1d42c09): fill_kobj_path: path
= '/devices/virtual/block/loop2'
crypto_alg_tested+0x52d/0x790 crypto/algapi.c:339
cryptomgr_test+0x18/0x30 crypto/algboss.c:226
kthread+0x357/0x430 kernel/kthread.c:246
binder: BINDER_SET_CONTEXT_MGR already set
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Modules linked in:
kobject: 'loop3' (0000000091226001): kobject_uevent_env
binder: 18723:18724 ioctl 40046207 0 returned -16
kobject: 'loop3' (0000000091226001): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'loop5' (0000000038d1e891): kobject_uevent_env
kobject: 'loop5' (0000000038d1e891): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop1' (0000000047f20675): kobject_uevent_env
kobject: 'loop1' (0000000047f20675): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (00000000f3ca3d42): kobject_uevent_env
kobject: 'loop0' (00000000f3ca3d42): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop5' (0000000038d1e891): kobject_uevent_env
kobject: 'loop5' (0000000038d1e891): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop1' (0000000047f20675): kobject_uevent_env
kobject: 'loop1' (0000000047f20675): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (00000000d1d42c09): kobject_uevent_env
kobject: 'loop2' (00000000d1d42c09): fill_kobj_path: path
= '/devices/virtual/block/loop2'
---[ end trace d2934b3fdb1c156e ]---
RIP: 0010:crypto_remove_spawns+0x7ac/0x1340 crypto/algapi.c:194
Code: 49 8d 7c 24 10 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 f2 06 00 00 49
c7 44 24 10 00 00 00 00 4d 8d 66 10 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 0f
85 ef 06 00 00 49 83 7e 10 00 74 0a e8 4e 9e 24 fe
RSP: 0000:ffff888054737b88 EFLAGS: 00010202
RAX: 0000000000000002 RBX: dffffc0000000000 RCX: 1ffff1100a8e6f86
RDX: 0000000000000000 RSI: ffffffff835d58d2 RDI: ffff888085c226b8
RBP: ffff888054737df8 R08: ffff88804fb4e4c0 R09: ffff88804fb4ed60
R10: ffff88804fb4ed40 R11: 0000000000000001 R12: 0000000000000010
R13: ffffed100a8e6f8e R14: 0000000000000000 R15: ffff888054737dd0
FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000110cfd0 CR3: 0000000094f35000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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[Eric Biggers]

This may be the bug that will be fixed by commit 6db43410179b ("crypto: adiantum
- initialize crypto_spawn::inst"), but I'm not sure. Since it's unlikely that
anyone will do anything else with this bug report, I'm going ahead and marking
this fixed for syzbot so that it doesn't suppress similar crashes in the future.

#syz fix: crypto: adiantum - initialize crypto_spawn::inst

- Eric